Competition between Birch reduction and fluorine abstraction in reactions of hydrated electrons (H2O)n(-) with the isomers of di- and trifluorobenzene.

Competition between Birch reduction and fluorine abstraction in reactions of hydrated electrons (H2O)n(-) with the isomers of di- and trifluorobenzene.
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水合电子 (H2O)n(-) 与二氟苯和三氟苯异构体反应中 Birch 还原和夺氟之间的竞争。

DOI:
10.1039/c1cp20505f
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发表时间:
2011
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
M. Beyer
M. Beyer
中科院分区:
--
文献类型:
--
作者:
Robert F. Höckendorf;O. Balaj;M. Beyer

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用傅里叶变换离子回旋共振(FT-ICR)质谱仪研究了二氟苯和三氟苯的异构体与水合电子(H(2O)O)(N)(-)(n=19-70)的反应。虽然所有研究的异构体都观察到了Birch还原,即H原子转移到芳香环上,但对于氟的提取,观察到了对取代方式的强烈依赖。采用纳米量热和G3计算相结合的方法对反应的热化学进行了分析。抽氟反应的放热比Birch还原至少高100kJ mol(-1),但后者是三种二氟苯异构体的主要反应途径。氟的提取和白桦树的还原面临着同等大小的激活障碍。相对势垒高度对替代模式很敏感。在纳米水环境中,1,3-二氟苯和1,4-二氟苯选择性地发生Birch还原反应。
The reactions of the isomers of di- and trifluorobenzene with hydrated electrons (H(2)O)(n)(-), n = 19-70, have been studied by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. While Birch reduction, i.e. H atom transfer to the aromatic ring, was observed for all studied isomers, a strong dependence on the substitution pattern was observed for fluorine abstraction. Nanocalorimetry combined with G3 calculations are used to analyze the thermochemistry of the reactions. Fluorine abstraction is at least 100 kJ mol(-1) more exothermic than Birch reduction, yet the latter is the dominant reaction pathway for all three difluorobenzene isomers. Fluorine abstraction and Birch reduction face activation barriers of comparable magnitude. The relative barrier height is sensitive to the substitution pattern. Birch reduction occurs selectively with 1,3- and 1,4-difluorobenzene in a nanoscale aqueous environment.
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